| Accountants for Property Limited | Professional & scientific | 2024 |
| Accurit Maintenance Services Ltd | Administrative & support | 2009 |
| Ace Auto Locks Ltd | Wholesale & retail | 2025 |
| Ace Canine Hydrotherapy Ltd | Other services | 2023 |
| Ace of Spice Restaurant Ltd | Hospitality | 2019 |
| Ace Trains Limited | Wholesale & retail | 1995 |
| Ace-Jj Ltd | Wholesale & retail | 2022 |
| Ace-Sg Limited | Wholesale & retail | 2022 |
| Acekom Ltd | Extraterritorial | 2015 |
| Aceva Design Ltd | Construction | 2013 |
| ACO DC Acoustics Ltd | Construction | 2020 |
| Aconet Consulting Limited | Information & communication | 2005 |
| Acorn Maintenance Kent Limited | Professional & scientific | 2004 |
| Acorn Maintenance Services Limited | Construction | 1998 |
| Acott Management Services Ltd | Construction | 2020 |
| ACR Accounts Ltd | Professional & scientific | 2024 |
| Acres of Diamond Limited | Real estate | 2019 |
| ACS Scaffolding Limited | Construction | 2018 |
| Actant Consulting Limited | Professional & scientific | 2011 |
| Activation Ventures Ltd | Real estate | 2026 |
| Active Balance Consultancy Limited | Professional & scientific | 2022 |
| Active Shipping & Training Limited | Professional & scientific | 2011 |
| Acuimetry Ltd | Health & social care | 2025 |
| Acupunctureherbs Ltd | Health & social care | 2026 |
| ACÁ Theatre Limited | Arts & recreation | 2016 |
| AD Family Ltd | Transport & logistics | 2024 |
| AD Fashions Ltd | Wholesale & retail | 2024 |
| Ad&Co Consultants Limited | Professional & scientific | 2024 |
| Ad-A Brickbuilding Services Limited | Administrative & support | 2022 |
| Adam Plumbing, Heating and GAS Limited | Construction | 2024 |
| Adama Sentina Ltd | Professional & scientific | 2023 |
| Adapt Search & Selection Limited | Administrative & support | 2017 |
| Adedyrock Global Services Limited | Health & social care | 2025 |
| Adekunle Faderin Ltd | Health & social care | 2023 |
| Adentea Limited | Administrative & support | 2009 |
| Adenusi & Company Limited | Professional & scientific | 2024 |
| Adetunji Ogunnaike Ltd | Information & communication | 2022 |
| Adex Healthcare Services Ltd | Health & social care | 2025 |
| ADF Legal Services Limited | Professional & scientific | 2025 |
| Adie & Sons (Plate Laying) Ltd | Professional & scientific | 2002 |
| Adkai Limited | Professional & scientific | 2022 |
| ADO Distribution Limited | Transport & logistics | 2025 |
| Adonai Services Limited | Administrative & support | 2017 |
| Adrenaline and Endorphin Productions Ltd | Arts & recreation | 2016 |
| Adrinika Limited | Health & social care | 2018 |
| Advanced Clinical Practice Services Ltd | Health & social care | 2026 |
| Advanced Flourish Care Limited | Health & social care | 2023 |
| Advanced Flourish Transportation Ltd | Transport & logistics | 2026 |
| Advanced Landscape Enterprise Limited | Administrative & support | 2018 |
| Advanced Linical Practise Services Ltd | Health & social care | 2026 |
| Advanced Medical Management Limited | Professional & scientific | 2015 |
| Advantage Accounting Services Limited | Professional & scientific | 2010 |
| Advantage Aluminium Ltd | Construction | 2022 |
| Adventure Kidz Limited | Arts & recreation | 2010 |
| Advertainment Ltd | Professional & scientific | 2012 |
| Advest-Co Ltd | Real estate | 2016 |
| Advice Solutions Limited | Financial services | 2021 |
| Advise Able Ltd | Financial services | 2017 |
| Adviser Circle Limited | Financial services | 2025 |
| AE Car Detailing Limited | Wholesale & retail | 2023 |
| AE Creative Hub CIC | Education | 2020 |
| AEB Technicals Limited | Administrative & support | 2018 |
| AED & Co Refurbishment Limited | Construction | 2025 |
| Aedis Consultancy Limited | Administrative & support | 2022 |
| AEG Consultancy (Kent) Limited | Professional & scientific | 2021 |
| Aegis Finance Ltd | Financial services | 2025 |
| Aeim Group Ltd | Administrative & support | 2017 |
| Aesthetics & Skin With Nurse Sally Ltd | Health & social care | 2022 |
| Aetos Rising Ltd | Education | 2024 |
| Afaad Properties Ltd | Real estate | 2024 |
| Afaad Store Ltd | Wholesale & retail | 2025 |
| AFD Realty Limited | Real estate | 2025 |
| Affinitext (UK) Limited | Information & communication | 2010 |
| Affordable GAS Appliance Servicing Limited | Construction | 2021 |
| Affordable Homes Properties Ltd | Real estate | 2025 |
| AFJ Electrical Ltd | Construction | 2019 |
| AFL Coaching Ltd | Other services | 2024 |
| Afokem Ltd | Arts & recreation | 2024 |
| Afreh Group Limited | Construction | 2018 |
| Africa Asia Scholars Global Network Limited | Other services | 2011 |
| African Caribbean Dental Association UK | Other services | 2013 |
| Afrinize Limited | Professional & scientific | 2013 |
| Afripride Ltd | Real estate | 2017 |
| Aftech++ Ltd | Information & communication | 2026 |
| Aftermarket Media Solutions Ltd | Information & communication | 2015 |
| Afya Limited | Professional & scientific | 2022 |
| Afzal & Co.Investments Ltd | Real estate | 2019 |
| AGA Team Company Ltd | Administrative & support | 2019 |
| Agape Health Care Investments Ltd | Health & social care | 2024 |
| Agble Medical Limited | Health & social care | 2012 |
| AGE UK Kent Rivers | Health & social care | 2009 |
| Agentrun Ltd | Information & communication | 2024 |
| Agger Labs Ltd | Information & communication | 2023 |
| AGK Tech Ltd | Wholesale & retail | 2024 |
| AGK Trading Ltd | Wholesale & retail | 2025 |
| AGM Contractors Limited | Construction | 2010 |
| Agri-Tech Global Technologies Limited | Administrative & support | 2010 |
| Agrico Workforce Ltd | Administrative & support | 2005 |
| AGS Glass Limited | Administrative & support | 2010 |
| AGS Glass UK Limited | Construction | 2024 |